What does SSD stand for, and what is its primary advantage?

SSD stands for Solid State Drive. Unlike a traditional hard disk drive, which stores data on a spinning magnetic platter read by a moving mechanical arm, an SSD stores data electronically in flash memory chips with no moving parts.

Because an SSD has no mechanical parts that need to physically move to locate data, it can read and write data much faster than a mechanical hard disk drive, which must wait for the platter to spin to the correct position and the read/write arm to move into place. This makes faster speed the primary advantage of an SSD over a conventional hard disk. SSDs are not primarily valued for larger capacity than hard disks, which typically hold more data at a lower cost per gigabyte, and "Secure Storage Device" and "Simple Storage Disk" are not what the abbreviation stands for.

Examination reminder: SSD should always be expanded correctly as Solid State Drive, and its key advantage over a hard disk drive is speed, arising from the absence of moving mechanical parts.